Throttle valve operating mechanism



Aug. 25, 1931. J. G. BLUNT ET AL 1,320,373

THROTTLE VALVE OPERATING MECHANISM Filed July 29. 1929 3 Sheets-Sheet 1 -FIG. I.-

INVENTORS James G. Blunf Boyer/M C/lfford ATTOR EY Aug. 25, 1931.

J. G. BLUNT ET AL THROTTLE VALVE OPERATING MECHANISM Filed July 29. 1929' 3 Sheets-Sheet 2 FICA.-

INVENTORS J'ames 6.5mm" v 150" ATT g- 1931. J. G. BLUNT ET AL 1,320,373

THROTTLE VALVE OPERATING MECHANISM Filed July 2 1929 '3 Sheets-Sheet 3 -FlG.5.-

ATTOR EY 51 the. emergency'of failureof fluid pressure, for

. operation by'manualpressure.

. 1 section, of the inechnism, shown in. Fig. 1;

having the throttle rod extended, through creased factor of safety, which etlejcts a suba rear, and, a side view, allo'n an enlarge l atented Aug. i

1 TEN=rfo =mE VJAMESLG. 3mm AND ROGER o' rroB-n, or sommnornnv, NEW ORK THROTTLE VALVE OPERATING "MECHANISM" Application filed July 29; 1929. Serial No. ssi,s2o..

This invention relates generally to throttle valve operating ,mechahisms, and more particularly to such mechanisms adapted normally for operation by fluid pressure, andin An object of thepresent Invention is to provide a throttle valve operating mecha nism of the type indicated, adapted for compact application in the cab ,of locomotives theback head of the boiler. e p a A further object of the invention isto provide a throttle valve operating mechanism of the type indicated which has an instantial economy in space, which is economical to manufacture and maintain, and which is highly efiicient in operation. 7

Theinvention claimed is hereinafter fully Inthe accompanying drawings: Figure 1,-

view of the construction shown in Fig, 1 Figs. 3, 4 and 5, are, respectively, a top plan,

scale, and partly inelevation and partly in W Fig. 6, an isometric view of the piston element of the motor; Fig. 7, a'perspective View on an enlarged scale, showing the operative connections between certain of the parts and, Fig. 8, a view in side elevation showing the mechanism inclusive of a throttle valve.

In the practice ofthe invention, referring descriptively to the specific embodiment thereofwhioh is selected for exemplification herein, the throttle valve 1, is normally operated byla fluid pressure motor2, controlled by an auxiliaryvalve 3, in turn controlled by ahandleveril.,-. p The throttle valve is, disposed inthe steam dome 5, of a locomotive boiler 6, and is oper- I atively connected to a throttle rod 7, by a stem 8 and a bell crank 'lever 9 journalled to a stand pipe'lO. The throttlerod' extends I through longitudinally of the boiler: and. passes astufiingbox 11, attached to the M back head 12, of the boiler. The rear end of nected at one end by a pivot pin 15,110 a fit ting16. on'the rear end of the throttle rod, and

at the other end by a pivot pin 1 7,to the hand lever.

.one fitted torv reciprocation:in-each of the 3ylinders.v The cylinders are formed in an integral castlng, which also comprises a collar lle for supporting the casting. on the .stufiing box 11; a lug 20 for supporting the casting on a bracket 21 attached tothebackhead 12 the seat 22, ofthe auxiliaryvalve 3 abutments 22a and 22b for limiting the movement of an auxiliary valve control lever 220;:

a lug 23a, for supportinga quadrant 28; and a pair ofparallel lugs 24:, for supporting the 1311701313111, 25, of bell crank-lever 26.. ,It is tofbe noted that'to, effect economy of space in the, cab, the cylindercasting is disposed parallel with the ,backhead. Q It is further (1 to benoted that to permit proper adjustment of the casting to the'backhead, the stuffirig 'boX, 11, is formed-with a spherical end 11a,

which fits against a bevelled edge12a, intheg ing studs 11d. Removable heads 186 are fastened to the' ends of thecylinders byv bolts The piston element ofthe motor is also? formed as :an integral casting, and comprises the throttlerod ispivotally connected to the p horizontally disposed hand lever 4:, by a pair of parallel links 14. The links 14, are conso I backl1ead, and with a flange 11o,:for attachv a stem 196 which connects the pistons and provide a slot 190, adapted to receive the end {of one arm 26wof bell crank lever 26, WhichT' lever" has its'other arm 26?) pivotally conpivotpin 19d, spans the slot 190 in the piston stem, and has itsendsfastened in bores the bell crank lever are transversely spaced.

embodies two parallelbars spaced apart to nected tothe'hand lever 1 by the'pin 17. A I

tween the jaws 260, of the arm 26a, of the 2 bell crank lever, The arms 26a and 26b of by a knuckle 2603 which is journalled on the pivot pin 25, fitted in the lugs 24.

The auxiliary valve 3 for controlling the movements of the piston element to effect the desired adjustments of the throttle valve, comprises the seat 22, a removable casing element 22d, a disc valve 221?, a stem 22f, for oscillating the disc valve, a follower 22g, and a spring 22h, interposed between the follower and an end of the casing element, and adapted to press the disc valve snugly against the seat 22. The control lever 220, which serves to oscillate the disc valve, has one of its ends rigidly connected to the valve stem 227', and its other end disposed for movement between the abutments 22a and 22b. The free end of the lever arm is pivotally connected to one end of a pair of parallel links 22j, by a pin 22%, which links have their other end pivoted to the hand lever 4 by a pivot pin 22m.

The seat 22 of the auxiliary valve is formed with three ports 22%, 522p, and 220-, the port 22;), being disposed intermediate the others and exhausting to the atmosphere, and the ports 22a and 22g communicating with con duits 221" and 228, respectively, which lead, respectively, into the outer "ends of the cylinders 18 and 18a. The valve disc is provided with a central channel or recess, adapted, upon selective movements of the disc, to permit exhaust of pressure fluid from one or the other of the ports 229" or 22g, and through the port 22p to the atmosphere. By referring to the drawings, it will be obvious that the valve disc is adapted to be moved to a central 'or neutral position where equilibrium of pressures on the pistons will be established and movement of the piston element arrested, with consequent maintenance of the throttle valve in any particular position of adjustment selected; to a throttle valve opening position, where pressure will be exhausted from the cylinder 18 and additional pres sure admitted to cylinder 18a, to effect the desired degree of opening of the throttle valve; and to a throttle valve closing position, "where pressure will be exhausted iirom the cylinder 18a and additional pressure admitted to cylinder 18,110 effect the desired degree of closure-of the throttle valve.

The operation of the mechanism is as follows: assuming that the parts are in total throttle valve closure position,=andthat proper 'fiuid pressure is present l or operating the motor, when the hand lever 4 is pulled outwardly, it will fulcrum on the pin 17, and through the links 227' push the control lever 220, so as to oscillate the disc valve 221? to a position where fluid pressure will be exhausted to the atmosphere from the cylinder 18 and admitted from a source of supply to cylinder 18a. The piston element will then be set in motion and through the bell crank lever 26 and throttle rod 7, will pull the throttle valve open. When substantially the desired opening of the throttle valve has been effected, the hand lever is latched to the quadrant 23, whereupon the slight continued movement of the piston element will act to move the auxiliary valve disc to neutral, where the pressures acting on the pistons will be balanced, and the throttle valve held positively in the desired adjustment. The various closing adjustments of the throttle valve are effected in a substantially similar manner by reversing the movement oi the hand lever.

In the emergency of failure of fluid pressure, the control lever 220 will move into contact with either the abutment 22a or the abutment 2%, upon movement of the hand lever, whereupon the hand lever will fulcrum upon the pivot pin 22m, to ellect the desired adjustments of the throttle valve.

It will be noted that by employing a construction wherein the piston element reciproca-tes in a, path transverse to the path oii reciprocation of the throttle red, a substantial economy of space in the cab is effected.

vVhile one of the preferred-forms of construction has been described and shown, it is obvious that many variations in procedure, form, arrangement, and construction may be resorted to, and the invention, therefore, is not limited to the particular embodiment disclosed, but includes such changes and modilication as come within the spirit and scope of the invention as set iorth in the appended claims.

The invention claimed and desired to be secured by Letters Patent is:

1. In a throttle valve operating mechanism, the combination of a reciprocable throttle rod; a fluid pressure motor embodying a piston element reciprocable in a path transverse to the rod; an auxiliary valve for controlling the application of fluid pressures to the piston element; and means connected to the piston element, the auxiliary valve, and the rod, adapted to control the operation of the auxiliary valve, and to translate reciprocal movements-of the piston element to reciprocal movements of the rod, said means in cluding a hand lever, a control lever connected to'the valve, a link pivotally connected to the control lever and the hand lever, and

a bell crank lever having; one arm pivotally connected to the piston element and another arm pivotally connected to the rod.

2. In a throttle valve operating mechanism, the combination or" a reciprocable throttle rod; a fluid pressure motor embodying a "piston element -reciproca ble in a path transverse to the rod; an auxiliary valve for controlling the application of fluid pressures to the piston element; and means connected l o'the piston element, the auxiliary valve, and

the rod, adapted to control the operation of the auxiliary valve. andto translate reciprorocal movements of "the piston element to reciprocal movements of the rod, said means including a hand lever, a link pivotally connected to the rod, a control lever connected to the valve, a link pivotally connected to the control lever and the hand lever, and a bell crank lever having one arm pivotally connected to the piston element and another V v throttle rod; a fluid pressure motor embody valve, a link pivotally connected to the con-i trol lever and to the hand lever, and a bell ing a reciprocable piston element; an auxil-' iary-valve controlling the application of fluid pressure to the piston element; a hand lever; and means operatively connecting the hand lever, the throttle rod, the motor, and the auxiliary valve, adapted to control the operation of the valve in response to movement of the hand lever, and to translate reciprocal movements of the piston element to reciprocal movements of the throttle rod, said means including a bell crank lever having one arm connected to the piston element and another arm connected to the hand lever, and the rod.

4.111 a throttle valve operating mecha nism, the combination of a reciprocable' throttle rod; a fluid pressure motor embodying a reciprocable piston element; an auxiliary valve for controlling theapplication of fluid pressures to the piston element; a hand lever, andmeans operatively connecting the hand lever, the throttle rod, the piston element'and the auxiliary valve, adapted to control the operation of the auxiliary valve in response to movements of the hand lever,

perpendicular to the vertical plane of the and to translate reciprocal movements of the piston element to reciprocal movements of the throttle rod, said means including a con-- trol lever connected to the auxiliary crank lever having one arm. pivotally con nected to the piston element and another arm pivotally connected to the rod,

5. In a throttle valve operating mechanism, the combination of a reciprocable throttle rod; a fluid pressure motor embodyiliary valve for controlling the application'of valve, adapted to control the operation of the valve in response to movements of the hand lever, and to translate reciprocalmovements of the piston element to reciprocal including a. link pivotally connected to the throttle rod and'to thehand lever,acontrol lever connected to the auxiliary valve, a-link pivotally connected tothe control lever-and, to the hand lever, and a bellcrank lever hav-' ing one arm pivotally connected to the piston element and another armpivotally connected to the first mentioned link.

6. In athrottle valve operating mechfinism the combination of a throttle rod-reciprocable'in the direction ofit's length; a

fluid pressure motor embodying tvvo axially" aligned spaced cylinders disposed in a-plane reciprocation in each of the cylinde'rs;fa

{pivot-pin connected to the piston stem; an auxiliary valve-for controlling the application'ofjfluid pressuresto the p stons; a hand- Tlever;and means operatively connecting the m'ent and the auxiliary" valve, adapted 1 to control the operation of the auxiliary valve in response to movements of the'hand-levenfandto translate reciprocal movementsof thepiston element to reclprocal movements of the throttle rod, said means including-.

link pivotally, connected to the throttle rod and the hand lever, aicontrol lever connected.

hand lever, the throttle rod, the piston eleto the auxiliary valve, a link pivotally con 1 nected" to the control lever and the hand lever, and abell crank leverhaving one arm connected to the pivot pin of the piston stem and another arm pivotally connectedto the first mentioned link. i v U 7. In-"a lthrottle valve operating mechanism, the"combination of a] throttle rod reciprocable in the direction of its length; a

fluid pressure motor embodyingtvvo1 axially aligned spaced cylinders disposed in a plane throttle rod,'and a piston element embodying two jspaced' pistonsconnected by a common I vot pincon'nected to thepiston stem; a slide blockmounted on thepin an auxiliary valve for controlling the application offiuid presisures to the-pistons; ahand'lever; and means operatively connecting the hand lever, the throttle rod,;the piston element, and the auxiliar'y; valve,adapted to control the'operation mg a reclprocable piston element; an aux-f of the auxili'ary valve in response tomove ments of the hand lever, andto translate re ciprocal movements ofthe piston element to reciprocal movements ,of'the throttle rod,

said means including'a link pivotally con-,

nected to the throttle rod and the hand lever, a control lever connected to the auxiliary valve, a link pivotally connected to the control lever and the hand lever, and a bell crank lever having one arm formed with a movements of the throttle rod, said means;

jaw slidablyfitted on the block of the pivot pin of the pistonstem, and another] arm link. a v

8. In a throttle valve operating mecha v 1257' i pivotally connected to the first mentioned V V I nism, the combination of a throttle rod re; f

ciprocable in the direction of its length; a

fluid pressure motor embodying ,two ax-ial- 1y aligned spacedcylindersdisposed -in.-a planeperpendicularto-the vertical plane of .thethrottlerod, and a piston element em mbodying two spacedpistons connectedybv-a commonstem, one ofthe pistonsbeingcdi'sposed fol-reciprocation ineach of the-cylinders ;an, auxiliary valve for controlling the :applioation of fluid pressures to Ithe I pistons; :30 a hand lever andlneans .operativelyconnectting: thehand lever, theathrottle rod, i the piston element, and the auxiliary valve, adapted to control the operation of the auxiliary velverinresponse to movements ofthe hand lever, totranslate reciprocal:rnovementsof the :piston' element to reciprocal movements of the .throttle rod, and inthe emergency of ,failure offluidpressure to operate the throt- :tle rod -in-response to the application .of manuel pressure :to the hand :lever, said meansincluding a link pivotally connected zto the'throttle rocland the handrlever, a pair "ofspaced stops, a control. lever connected to theauxiliary valve and disposed intermediate the stops, a link pivotally connectedto the control levervandthe hancl lever,vand=a -bel1 crank lever (having one arm gpivotally connected to the piston element andianother arm pivotally connected to the first men- :tioned v link.

9. In a locomotive the combination of a longitudinally reciprocable throttle valve rod a fluid pressure motor cylinder; a piston in the cylinder reciprocahle in a vpathsubstantiallywtransverse .to the 1 reciprocationsi of .thethrottlerod; an auxiliary valve ifor'controlling the operations of thepiston a'hand lever pivoted .to swing for operating the valve ai fixed element ;,v and means operatively connected tothe piston, to thevalve rod, to the hand lever, and to the fixed element, for translating the reciprocal movements of the piston to reciprocal movements of the throttle valverod, and to insure simultaneous swingings of the hand lever with reciprocations 1 of:tl1e piston.

JAMES G. BLUN-T. ROGER CLIFFORD. 

